1. FramelessWindowHint seem to be a redudant leftover of BypassWindowManagerHint, media viewer uses fullscreen state now that implies lack of the frame
2. MaximizeUsingFullscreenGeometryHint is useless since media viewer doesn't use maximize
3. Transient parent/window modality dance is replaced with minimum/maximum size just like in other places where tiling shouldn't be done
4. setWindowState(WindowFullScreen) is replaced with showFullScreen that ensures the flag is set on each show
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